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4.4.5.6 Parameter Range and Default Value in SIMV Mode
Parameter Range Step Default SIMV mode
TV TV 20 to 1500 ml
20 to 100 ml: 5 ml
100 to 300 ml: 10 ml
300 to 1500 ml: 25 ml
SIMV-VC
Pinsp 5 to 60 cmH2O 1 cmH2O 15 cmH2O SIMV-PC
SIMV Rate 4 to 60 BPM 1 BPM 10 BPM
Tinsp 0 to 4.5 s 0.1 1.5 s
Finsp 20 to 85 L/min 1 L/min 60 L/min
Plimit 10 to 100 cmH2O 1 cmH2O 30 cmH2O
Psupp 5 to 60 cmH2O 1 cmH2O 15 cmH2O
PEEP
OFF, 4 to 30
cmH2O
1 cmH2O OFF
Trigger Window 5 to 90 % 5 % 25 %
Pressure -20 to -1 cmH2O 1 cmH2O -2 cmH2O
Trigger
Level
Flow 0.5 to 15 L/min 0.5 L/min 3 L/min
PSV Insp
Termination Level
5 to 60 % 5 % 25 %
SIMV-VC
SIMV-PC
4.4.6 Pressure Support Ventilation (PSV)
4.4.6.1 Description
Pressure support ventilation (hereinafter referred to as PCV) mode is an auxiliary breathing
mode which needs patient’s spontaneous breathing to trigger mechanical ventilation. When
the patient’s spontaneous inspiration reaches the preset Trigger Level, the ventilator begins to
deliver gas at the preset Finsp to make Paw rise to the preset Psupp rapidly. After that, the
ventilator slows down the flow through the feedback system to keep Paw constant. When the
inspiration flow drops to the preset PSV Insp Termination Level, the ventilator stops
delivering gas and the patient is allowed to expire, waiting for next inspiration trigger. If
inspiration is not triggered within the set time (Backup Mode Active), the system
automatically switches to the backup ventilation mode—PCV.
In the PSV mode, you do not need to set TV. TV depends on the patient’s inspiratory force
and pressure support level, compliance and resistance of the patient and of the whole system.
The PSV mode is used only when the patient is driven by reliable breathing because
breathing must be fully triggered by the patient during ventilation.
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